Micro sample 692

Information

Phytoliths: Fourteen stone tools from Operation V, a single residential architecture complex and its associated domestic trash deposits, were analyzed for evidence of phytoliths and starch grains. They included stone flakes, cores or chopping tools, hand-held grinding stones, and a hammer stone. Of these, two were positive for both maize phytoliths and starch grains, one was positive for maize phytoliths, and nine were positive for maize starch. Two additional stone tools had no identified maize remains but were positive for other plants, (Haas et al. 2013: Table S3). Haas and colleagues were able to date 27 radiocarbon samples from this operation and their median ages ranged between 4435 and 4040 cal. B.P. (Haas et al. 2013:4, Table S1). The oldest radiocarbon date associated with the deposits in which the stone tools testing positive for phytoliths were found is AA-84573 from Operation V, Unit 2, Level 3A--located just below Level B, Feature 1, where excavators recovered a large oval bifacial chopping tool with maize phytoliths on one cutting edge. Since this is the oldest of three radiocarbon dates associated with deposits containing tools that tested positive for phytoliths, we will use it as the representative date for mapping the early distribution of maize phytoliths at the site.

Radiocarbon Date

Attached Files

Caballete_(aa-84573)

References Cited

Haas, Jonathan, Winifred Creamer, Luis Huamán Mesía, David Goldstein, Karl Reinhard and Cindy Vergel Rodríguez
    2013    Evidence for Maize (Zea mays) in the Late Archaic (3000-1800 B.C.) in the Norte Chico Region of Peru. PNAS Early Edition:1-5.

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